here we have two ‘Philco’ brand vintage vacuum tubes. Both are 6SN7 GTB, however, one has three black plates and a chrome top and the second has two grey plates. As the above mentioned, the two- plate tube tested at 97, with the second, three – plate tube testing 95. Both are in the green “good”a section
Item Tag: 6SN7 GTB
6SN7GT Tung-Sol radio audio amplifier vacuum tubes 3 valves tested 6SN7GTB 6SN7
Tubes have grey ribbed plates, clear top, bottom side rectangular getter. tubes tests Price is for all tubes pictured.
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GE 6SN7GTB Vacuum Tube Vtg Tested Good in Worn RCA Box
Model 257 or 151 tester on 6/25/26. Worn, mismatched, RCA 6SN7GTB box.
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Pair Of GE 6SN7GTB Tubes – Black Plate – Filament Bridge – Hickok Tested
This tube was tested on a Hickok 600 tube tester. Tube with date code EW tested 3000/2700 gm.
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NOS Pair RCA 6SN7GTB Tall Bottle Matched Codes Black Plates D Getters Test NOS
NOS Pair RCA 6SN7GTB Vacuum Tubes Tall Bottle | Black Plates | D Getters | Matched Codes 1963 Production. Tested on an Amplitrex AT1000.
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6SN7GTB 3 Tubes Same Batch NOS
3 NOS TUBES FROM THE SAME BATCH NEVER USED
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SYLVANIA 6SN7 GTB TUBE 1968 CHROME TOP HALO BLACK V PLATES MATCHED SET
Rare late-1968 Sylvania production featuring the highly sought-after PERFECT MATCHED SET. BLACK V PLATES. Matched Codes: 6844 AKL. EXCL USIVE HIGH FIDELTY TUBE. ✅ Strong Matching Pair. Production Year: Emporium, PA – 1968.
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Pair RCA 6SN7GTB short glass Black Plate Tubes Balanced STRONG 6SN7
PairRCA 6SN7GTB. Black Plate Balanced Tubes. These tubes test 85/85 and 90/90where a new tube tests 85/85.
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Philco 6SN7GTB Vacuum Tube Vtg NOS Tested Good in GE Box
Model 257 tester on 6/25/26. Clean, but mismatched GE box.
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Matched Pair 1958 GE Side Getter 6SN7GTB Tubes STRONG! 6SN7
Matched Pair 1958 GE Side Getter 6SN7GTB Tubes. These tubes test 85/85 where a new tube tests 85/85.